If y1 and y2 are the solution of the ...

If `y_1` and `y_2` are the solution of the differential equation `(dy)/(dx)+P y=Q` , where `P` and `Q` are functions of `x` alone and `y_2=y_1z` , then prove that `z=1+cdote^(-fQ/(y_1)dx),` where `c` is an arbitrary constant.

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